Skateboard



FIG. 1 is a top plan view of the skateboard showing my new design in an assembled condition;

FIG. 2 is a side elevation view of the skateboard showing my new design in an assembled condition; and,

FIG. 3 is a front elevation view of the skateboard showing my new design in an assembled condition.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a skateboard, as shown and described. 